In general, you do not have to delete user-defined project files or the contents of a project base directory. After you have created a user-defined project, you can add and delete files as necessary using the project management options from the Code window. You can also change your build model and other project components using the Project Properties window.

Deleting user-defined project files is not recommended where projects are not single-user, self-contained projects as this might prevent other developers from accessing your source files, built files, or build model.